package com.neu.common;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.neu.entity.Admin;
import com.neu.service.AdminService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;

@Component
public class JwtTokenUtils {
    private static AdminService staticAdminService;
    private static final Logger log = LoggerFactory.getLogger(JwtTokenUtils.class);

    @Autowired
    private AdminService adminService;

    @PostConstruct  //spring初始化的时候加载
    public void setUserService() {
        staticAdminService = adminService;
    }
    //生成token
    public static String getToken(String userId,String password) {

        return JWT.create().withAudience(userId) //将userId保存到token里面，作为载荷
                .withExpiresAt(DateUtil.offsetHour(new Date(),2))
                .sign(Algorithm.HMAC256(password));
    }
    //获取当前登录的用户信息
    public static Admin getCurrentUser() {
        String token = null;
        try {
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            token = request.getHeader("token");
            if(StrUtil.isBlank(token)){
                token = request.getParameter("token");
            }
            if (StrUtil.isBlank(token)) {
                log.error("获取当前登录的token失败， token: {}", token);
                return null;
            }
            //解析token，获取用户id
            String adminId = JWT.decode(token).getAudience().get(0);
            return staticAdminService.findById(Integer.valueOf(adminId));
        } catch (Exception e) {
            log.error("获取当前登录的管理员信息失败，token={}", token,e);
            return null;
        }
    }
}
